Improvement in mechanical movement



N, BRADFORD.- MECHANICAL MOVEMENT.

No. 103,971. Patented June '7, 1870.

idnitmi tatrt NATHANIEL BRADFORD, or ADDISON, MAINE.

Letters Patent No. 103,971, dated June 7, 1870.

IMPROVEMENT IN MECHANICAL MOVEMENT.

The Schedule referred to lII t hQIQ Letters Patent and making part of the lame.

To all whom t't may concern Be ,it known that I, NATHANIEL BRADFORD, of Addison, in the county of -Washington and State of I Maine, have invented a new and improved Mechanical Movement; and I do hereby declare that the following is a full, clear, and exact description of the same, reference being had to the accompanying drawing forminga part of this specification, in which the figure is a side elevation. I

This invention relates to the application of lever power to the performance of any mechanical function.

The invention has for its object the proportioning of power to resistance in such manner that when resistance is small, power may be reduced in order to the gaining of speed, and when resistance is great, power may be increased by the sacrifice of speed.

In the drawing-- A, a section of the deckof a ship., a, a standard rising therefrom. b, a lever, pivoted, at its center in a recess in the standard a, and having orifices in its ends, in which to insert the-extremities of handles e, by which the lever is worked.

d, a second lever, pivoted at its center in the recess in the standard a, above the lever 12, and likewise provided with orifices in its ends for the insertion of the handles 0.

e care inclined rods at opposite sides of the standard a, jointed at their upper extremities to the lever 11 and at their lower extremities to the lever b. The distances from the fulcrum of the lever b to the points where the rods are connected with said lever are twice as great as the distances from the fulcrum of the lever d to the points of connection of the rods with it. From the lower lever, connection is made by rods at each side of the standard with a Windlass or pump below, which Windlass is worked bymoving the lever up and down through the instrumentality of the handles.

When the weight to be raised by said Windlass is comparatively light, the handles are applied to the ends of the 'lower lever, in which the points of resistance are at h h, and by which the windlass may be rotated rapidly. But when the weight is comparatively heavy, the handles should be shifted to the orifice in the ends of the upper lever, in which the points of resistance, which are the points of connection with the rods e, are twice as near the fulcrum as in the lever l). The efi'eotis, therefore, twice as great when the same power which was applied to the lever 11 is applied to the lever (I, while the speed of the windlass is reduced about one-third. I

I have found by actual. experiment that this apparatus only works well when the levers lid-are inclined away fi'om each other at each side of the standard a, as shown in the drawing. I do not, however, limit myself to the levers when thus inclined, but propose to cover them when straight, as well.

Having thus described my invention,

What I claim'as new, and desire to secure by Letters Patent, is-- p The combination of the levers b d, pivoted in the standard a, with the rods 0, when the distances from the fulcrum of one lever to the points of its connection with the rods are less than the distances from the fulcrum of the other lever. to. the points of its connection with the rods, substantially as and for the purpose described.

NATHL. BRADFORD.

Witnesses:

CHAS. -A. PETTIT, Tnos. D. D. OURAND. 

